package com.ds.lens.data.filter;


import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class CrossDomainFilter implements Filter {

    @Override
    public void destroy() {

    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
            throws IOException, ServletException {
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        response.setHeader("Access-Control-Allow-Origin", "*");
        response.setHeader("Access-Control-Allow-Methods", "POST, GET, OPTIONS, DELETE");
        response.setHeader("Access-Control-Max-Age", "3600");
        response.setHeader("Access-Control-Allow-Headers",
                "Origin, X-Requested-With, Content-Type, Accept, Authorization, LoginType");//Authorization用于访问验证
        response.setHeader("Access-Control-Allow-Credentials", "true");

        //处理跨域的探测请求
        if (((HttpServletRequest) servletRequest).getMethod().equals("OPTIONS")) {
            response.setStatus(HttpServletResponse.SC_OK);
            return;
        }

        filterChain.doFilter(servletRequest, servletResponse);
    }

    @Override
    public void init(FilterConfig arg0) throws ServletException {

    }

}
